Move another bunch of extension API tests to manifest_version 2.

chrome/test/data/extensions/api_test/content_scripts/view_source/background.html

-<script>
-chrome.test.runTests([
-  function noContentScriptsInViewSource() {
-
-    chrome.extension.onRequest.addListener(
-      function(request, sender, sendResponse) {
-        chrome.test.fail('Got a content script request from view source mode.');
-    });
-
-    // We rely on content scripts running at document_start to run before we
-    // receive a tab update with 'complete' status.
-
-    chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
-      if (changeInfo.status === 'complete' &&
-          tab.url.indexOf('test_file.html') != -1) {
-        chrome.test.succeed();
-      }
-    });
-
-    chrome.test.getConfig(function(config) {
-      chrome.tabs.create({
-        url: 'view-source:http://localhost:' + config.testServer.port +
-             '/files/extensions/test_file.html'});
-    });
-  }
-]);
-
-</script>
+<!--
+ * Copyright (c) 2011 The Chromium Authors. All rights reserved.  Use of this
+ * source code is governed by a BSD-style license that can be found in the
+ * LICENSE file.
+-->
+<script src="background.js"></script>